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经营范围
发明名称
Piezoresistive semiconductor microphone
摘要
申请公布号
US2905771(A)
申请公布日期
1959.09.22
申请号
US19570659272
申请日期
1957.05.15
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BURNS FRED P.
分类号
H04R23/00
主分类号
H04R23/00
代理机构
代理人
主权项
地址
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